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An Escherichia coli mutant resistant to isoniazid (WG497) contained 0.6 mumole of extracellular pyridoxamine and pyridoxamine phosphate in the early stationary phase. A suppressed lysine mutant (AT1024) contained 1.4 mumoles of pyridoxal phosphate under the same conditions. The internal concentration of vitamin B(6) was one-half of normal for AT1024 and increased fivefold for WG497.

Identification of the Forms of Vitamin B 6 Present in the Culture Media of “Vitamin B 6 Control” Mutants

Identification of the Forms of Vitamin B ₆ Present in the Culture Media of “Vitamin B ₆ Control” Mutants